Casing spear



dit

heb., Ztl; lwmbh .laitier lrrrbrn` inventif Gesine sit-inea.

i application inea retinaly 1e, 1921. seriali no. 445,341.

To all whom may concern.' y

`Be it lrnovvn that l, Cnnsfrnn ll/l. (tunes, a citizen of the United `fitr-tesj residing; at lios `Itngeles, inthe county of lios Angeles and `fltate ot California, have invented certain new and useful Improvements in Casing tiljaears; and l de hereby declare the toll' ve ing;l to be tull,` clear, `and enact description oitthe same,`reterence being had to the acconipanying"drawings, forming part of this specification. y A This invention relates to a spear ttor use with o'il Well equipment and has particular application to devices used ttor pulling; pipe or casing :from a Well When it is desired to remove `such pipe or casingat any distance belovvl the surface. The principal object otthepresent invention is tolprovidela spear thatcan be dis- `ass`ernbled when the spear becomes stuck, this disasseinbling,- beingin such manner j that'the individual partsotthe spear which are left in the casing upon removal oit the stern may bereadily lished out, thus avoiding all danger of: losing a hole by the plug'- ging; ot same bythe spear.

A `further object ot the present invention is to provide a` combination washdown trip spear that Will be applicable for useeith'er in pulling' pipe or casing with an ordinary7 i application ot torce, as with a lifting hoist or `with a Wallrinnbearn and a pair of jars the latter construction pullingthe spear with al jerk, giving. a resulting ltorce which is a combination of pulling and giving oit harnnier blows.

filtilliirther objects of the invention will be apparent trorn the following description and the claims and relateparticula-rly to the pilot-head or retaining' member perse, the Wedgefitself and its combination with the retaining head and the double use of the dollar carried by the` stern.

In all ot the present types of spears with y bull-doghold on the pipe. it is notpossible i to disassemble the tool Without 'plunging' the Way, the spear so pluggingV the hole that it wasnetpossibleto pass it with aninstru- Ihent, or tobreak up the spear owing to the rocky or other dithcult fo'rrnation oit' earth.

lin the present device means are provided hole with the stuclt slips and allied rnernbers. Valuable Wells have been lost in this,

'for flushing the pipe or casing WithWater so as to tree the string from mud torinations so that, no matter what the depth, these fishing tools may be inserted Without ditliculty even thoughroclty :formations o1 the more diiiicult combination ot rock and mud. ln the dravvingsf- Figure l is an elevation of a combination Washdovvn trip spear constructed in accordi ance With the present invention.

Fig. 2 "is an enlarged central sectional view through the lower end thereof.

Bis a transverse section on lineL-f-B of Fig. 2. y

Fi l is a transverse sec-tion ou line 4 4 of lig. 2.

Fig; 5 is a transverse? section on line 5`-5 olil Fig. 2.

Fig. 6 is a transverse section on line @#6 oflfig. 2. y

rlhe stein 10 is generally cylindrical throughout its extent, except Jfor collar 1l to be described in detail later and the usual attaching; end consietinggI of a squared portin 12 just `belovv` the cylindrical' enlargement lll- Whieh forms a shoulder 15 with the standard tapered threaded tool point 1'6.

be atleastas' largfe in diameter as the Wedge and that the diameter oft the gripping' teeth when in collapsed position shall be slightly greater than the ring that holds the reins.' y

The Wedge 24% has a cylindrical bore incase thev spear is used with the rotating string, but it used With the ,j ar, as in the example shown, the bore of the Wedge is `tapered at about the rate ot one inch per toot toi' an eight inch spear, this tapered bore receiving the hollow cone extension 25 ot the pilot, this extension being slit as at 26 so as to ti ghtly bind against the stern and tol provide a `rnore fr'ictional engagement between the Vgenerally circular vvedgel24t andthe pilot, the latter being; threaded tothe stern, as pren viouslv described. At the lower' end ot the wedge are provided a plurality7 ot teeth 27 shown in the drawings as two in number, each iitting within a square slot 28 in the pilot 20, thus forming a connection which prevents relative rotation oi' the pilot and wedge when the parts are in the position shown in Fig. l. t its smaller end, the wedge is machined to lit snuglyv upon the stem l0, but to slide ireelv thereon.

it ringl 230 surrounds the sten'i 10 at a point between the collar il and the wedge 2st and lloosely carries a plurality ot reins 31 which are secured to the ring` in anv desired manner, such for example as the loose rivet connections the looseness beingdesirable in order to permit a slight pivoting of the reins in the ring. At its upper end each rein carf ries a down-turned hoolrlel of the usual type and adapted to slide up the tapered portion 36 oit the collar over its cylindrical portion 37 and to engage against the shoulder 38 which may be either flat as shown, or else slightl7 dished, as is a little more customary in the art. The diameter oi" the cylindrical portion 37 is slightly less than the minimum inside diameter of the ring 30 which is the distance between the inner faces of opposite reins 31, as seen in Fig. 3.

The gripping member is composed of a plurality oi slips s() each bounded bv a plane face on the stem side and b v a cylindrical toothed surface tl. of standard construction on the outside. Each of the `four slips 40 is connected to or is integral. withone of the reins 31 and slides upon one of the plane inclined surfaces 43 of the one-piece wedge 24. A shoulder 44 is provided between the cylindrical larger end of the wedge and the flat tapered surface 43 in order to prevent the slips 'from overrunning the wedge.

`The operation is as follows: The spear is let down into the well to a point below the casing to be removed and the spear is then jerked upward.l The pilot 20 and stem 10 being then practioalh7 integral will rise carrving with them the wedge 24, which while slidalole upon the stem l0, nevertheless rests b v'gravity against the pilot and is held against rotation by the tooth and slot connection mentioned. The rising of the wedge member spreads the slips against the slight yielding resilience of the reins and drives the'four tripping members into contact with the easing. The easing is then hoisted from the'well in the normal manner unless such obstruction is encountered as torender itimpossible to move the casing. In such cases, when the spear has become stuck and it is not possible from the surface to move it either up or down, the stem 10 is rotated right-y handed which frees the pilot member,` since thev threads which hold this member to thev stem are left-handed- The pilot or retaining member is held to the wedge. by fric tional coi'itact, but this `frictional contact is intentionallyv rerv much less than the fric-- tional contact between the wedge and thel Slips, so that it is always possible to drive down the point or head and then free it by this unscrewing. even though it 'is not possible to drive do vn the slips or the wedge The stem is now jarred against the wedge b v striking the collar il against the upper smaller end ot the wedge which drives the latter downward and trees the slips. .kt this` time the stem is drawn upward until tho hooks Ilsl engage the shoulder 2S oi the collar so that when the stom is withdrawn .from the well the slips accompanyY it, leaving the wedge :tast iu the hole and the pilot mem-- ber either at the bottom oi the hole or at some distance below, The later fishing out ot the hollow wedge with suitable tools is a simple matter as is also the rescue of' the pilot head, since the latter is ot such shape that it alwavs remains vertical in the hole.

lVhat I claim is:

l. In a casing spear, a stem, slips slidablo thereon, a. retaining` member detachablyv se cured to said stem, and means tor holding said slips and said retaining member in fixed relation so that said retaining member may be detached from said stem when the slips are stuck in the well.

2. In a Casing spear, a stem, slips slidable thereon, a retaining member detachably secured to said stem, and means carried bv said stem between said slip and said retaining member for holding said slips and said re taining` member in fixed relation so that the said retaining member may be detached from said stem.

3. In a casing spear, a stem. a retaining member threaded to the lower end of said stem, a. wedge member slidablo on said stem and having a locking engagement with said retaining member` and slips engageablc with said wedge.

4. In a casing spear. a stem, a pilot member threaded thereto.y a tapered wedge slidable on said stem, means 'for locking said wedge and said pilot against relative rotation, slips slidable on the tapered surface of said wedge, and means carried b v said stem for pulling said slips awawT trom said wedge and withdrawing said wedge awav from said slips when the la: er are in locked position.

5. In a casing spear, a hollow stem, a pilot member thread-ed thereto and having a discharge orifice therethrough, a plurality of slips slidable with respect to said stom, and a hollow member surrounding said stem and adapted to hold said slips and said pilot member in fixed relation when the spear is stuck in the woll.

6. In a casing spear, a stem, a collar on said stem, a wedge member having a tapered surface, a slip slidable on said tapered surface and past the smaller end. thereof, means meneer y tt Carried by seid slips "for engaging seid. eoller, whereby seid slips may be pulled from engagement with said Wedge.

n a casing spear, e stern, tapered Wedge slideble'on seid stern shoulder on seid stem limiting longitudinal movement olf said Wedge in one direction, si retaining,` :member on said stern limiting longitudinal movement of said Wedge in the opposite direction, and zrplurelity oit slips. slidable With respect to seid stern and receiving between them tbe smaller end oit said tapered Wedge.

8. ln e easing spear, e stein, :i `tapered Wedge slidably mounted on seid stein end'` having e tapered bore, :L retaining member detecbebly secured to said stern and having n tapered projection adapted to frictionelly engage the tapered bore of seid Wedge, and slips slidebleon said Wedge.

9. ln e easing speer e Stem7 e collar on Seid stern, e ringr loosely mounted on eeid stem and adapted to pees seid coller, zr plurality oit slips carried by said ring, a Wedge member slidably mounted on seid stein and adapted to engage with seid collar, end means carried by said ring to engage said collar to Withdraw seid slips 'from `seid Wedge.

l0. A wedge for :t casing spear characterized by the provision of tapered bore end si` sloping outer tace.

ll. A wedge for e casing speer @herunterized by the provision of zr cylindrical bore at its smaller end adopted to slide-bly receive e speer stem and by the provision of e sloping slip-engzrging tace unrestricted ut. its` smaller end and bounded by et shoulder at its larger end.

CHESTER M. GUESS. 

